The paper-based Dr Grabow Pipe Filters are specially designed for Dr. Grabow pipes. Each pack contains ten of these popular filters. Use them to get a cool and dry smoke each time you light a bowl in your favorite American-made smoking pipe.
Brand: Dr Grabow
Model: 6mm Pipe Filters
Filters in a Pack: 10
Not sure how to really rate a filter but this fits in various pipes I have and does cool and absorb moisture well. I will purchase again.